About the data.path

Elastic Stack Elasticsearch
1

As I have two elastic nodes and set both of their "data.path" to "/var/elastic/data".

After indexing data, I found a strange state:
the first node:
/var/elastic/data/0/....indices
the second node:
/var/elastic/data/0/...indices
/var/elastic/data/1/...indices

why the second node has directory "1" and "0" while the first only has "0"?

2

Are these two nodes on the same machine? or did you start multiple Elasticsearch processes on the second machine? The 0 is the directory for the first running Elasticsearch process and 1 is the directory for the second running Elasticsearch process so the fact that you have both suggests that (intentionally or unintentionally) you have two Elasticsearch processes running on that machine.

3

Thanks for your reply.
I may really run two elastic processes or different versions(maybe) in the past so I have two directories now.